【发布时间】：2008-12-11 12:50:04
【问题描述】：
我正在开发一个绘制简单点网格的应用程序。我希望鼠标在网格上的点之间捕捉，最终在网格上画线。
我有一个方法可以获取当前鼠标位置 (X,Y) 并计算最近的网格坐标。
当我创建一个事件并尝试将鼠标移动到新坐标时，整个系统变得不稳定。鼠标在网格点之间不平滑。
我复制了下面的代码示例来说明我正在尝试做的事情。关于如何消除鼠标移动中的跳动，有没有人可以向我提供任何建议？
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace GridTest
{
public partial class Form1 : Form
{
Graphics g;
const int gridsize = 20;
public Form1()
{
InitializeComponent();
g = splitContainer1.Panel2.CreateGraphics();
splitContainer1.Panel2.Invalidate();
}
private void splitContainer1_Panel2_Paint(object sender, PaintEventArgs e)
{
Drawgrid();
}
private void Drawgrid()
{
for (int x = 0; x < splitContainer1.Panel2.ClientSize.Width; x += gridsize)
{
for (int y = 0; y < splitContainer1.Panel2.ClientSize.Height; y += gridsize)
{ g.DrawLine(Pens.Black, new Point(x, y), new Point(x + 1, y)); }
}
}
private void splitContainer1_Panel2_MouseMove(object sender, MouseEventArgs e)
{
Point newPosition = new Point();
newPosition = RoundToNearest(gridsize, e.Location);
Cursor.Position = splitContainer1.Panel2.PointToScreen(newPosition);
}
private Point RoundToNearest(int nearestRoundValue, Point currentPoint)
{
Point newPoint = new Point();
int lastDigit;
lastDigit = currentPoint.X % nearestRoundValue;
if (lastDigit >= (nearestRoundValue/2))
{ newPoint.X = currentPoint.X - lastDigit + nearestRoundValue; }
else
{ newPoint.X = currentPoint.X - lastDigit; }
lastDigit = currentPoint.Y % nearestRoundValue;
if (lastDigit >= (nearestRoundValue / 2))
{ newPoint.Y = currentPoint.Y - lastDigit + nearestRoundValue; }
else
{ newPoint.Y = currentPoint.Y - lastDigit; }
return newPoint;
}
}
}
【问题讨论】：
标签： c# grid mouse cursor-position onmousemove